A uniform electric field is one in which the electric lines of
force are parallel and equally spaced. Here the direction of
electric filed will be from positive charge to negative charge.
When a proton is released from rest in a uniform electric field it
experiences a force due to the electric field and gets accelerated
in the direction of the field. As the proton is moving in uniform
electric field it experiences a constant electric force
and hence it moves with constant acceleration.

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Step 2 of 2

b)

The electric potential energy of pair of charges
is

Hereis
the distance of separation between the charges, andis
Coulombs constant.

The proton (positive charge) moves away from the positive of the
uniform electric field. So from the above equation, as the distance
between these charges increases, the potential energy decreases.
From law of conservation of energy a decrease in potential energy
is equal to increase in kinetic energy of proton. Therefore, the
potential energy of proton decreases, while its kinetic energy
increases.

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